In the Midwest, Minnesota and Iowa already allow gay marriage. The 12 other states in the U.S. that have OKd same-sex unions are California, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, Vermont and Washington.

Washington, D.C., also allows it.

Hawaii is debating a measure that would legalize gay marriage. Depending on the timeline, either Hawaii or Illinois could become the nation’s 15th state to legalize such unions.